[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"minerals:one:1441":3},{"id":4,"longid":5,"guid":6,"name":7,"shortcode_ima":8,"entrytype":9,"entrytype_text":10,"varietyof":11,"synid":8,"polytypeof":8,"groupid":8,"weighting":12,"nolocadd":13,"blacklisted":13,"mindat_formula":14,"mindat_formula_note":8,"ima_formula":8,"elements":15,"sigelements":18,"key_elements":8,"impurities":8,"cim":8,"ima_status":8,"ima_notes":8,"ima_history":8,"approval_year":8,"publication_year":8,"discovery_year":8,"strunz10ed1":19,"strunz10ed2":19,"strunz10ed3":19,"strunz10ed4":8,"dana8ed1":19,"dana8ed2":19,"dana8ed3":19,"dana8ed4":19,"csystem":8,"cclass":8,"spacegroup":8,"spacegroupset":8,"a":8,"b":8,"c":8,"alpha":8,"beta":8,"gamma":8,"aerror":8,"berror":8,"cerror":8,"alphaerror":8,"betaerror":8,"gammaerror":8,"va3":8,"z":8,"csmetamict":13,"commentcrystal":8,"twinning":8,"tranglide":8,"parting":8,"epitaxidescription":8,"morphology":8,"tlform":8,"hmin":8,"hmax":8,"hardtype":8,"vhnmin":8,"vhnmax":8,"vhnerror":8,"vhng":8,"vhns":8,"commenthard":8,"dmeas":19,"dmeas2":19,"dcalc":8,"dmeaserror":8,"dcalcerror":8,"commentdense":8,"lustre":8,"lustretype":8,"commentluster":8,"diapheny":8,"streak":8,"colour":8,"commentcolor":8,"colors":8,"streak_colors":8,"luminescence":8,"uv":8,"cleavage":8,"cleavagetype":8,"fracturetype":8,"tenacity":8,"commentbreak":8,"opticaltype":8,"opticalsign":8,"opticalalpha":8,"opticalalpha2":19,"opticalalphaerror":8,"opticalbeta":8,"opticalbeta2":19,"opticalbetaerror":8,"opticalgamma":8,"opticalgamma2":19,"opticalgammaerror":8,"opticalomega":8,"opticalomega2":19,"opticalomegaerror":8,"opticalepsilon":8,"opticalepsilon2":19,"opticalepsilonerror":8,"opticaln":8,"opticaln2":8,"opticalnerror":8,"optical2vcalc":8,"optical2vcalc2":8,"optical2vcalcerror":8,"optical2vmeasured":8,"optical2vmeasured2":8,"optical2vmeasurederror":8,"rimin":8,"rimax":8,"opticaldispersion":8,"opticalpleochroism":8,"opticalpleochorismdesc":8,"opticalbirefringence":8,"opticalcomments":8,"opticalcolour":8,"opticalinternal":8,"opticaltropic":8,"opticalanisotropism":8,"opticalbireflectance":8,"opticalextinction":8,"opticalr":8,"specdispm":8,"ir":8,"electrical":8,"magnetism":8,"thermalbehaviour":8,"other":8,"industrial":8,"occurrence":8,"otheroccurrence":8,"type_specimen_store":8,"description_short":8,"aboutname":20,"rock_parent":8,"rock_parent2":8,"rock_root":21,"rock_bgs_code":8,"meteoritical_code":8,"updttime":22,"reviewed_at":8,"variety_of":23,"varieties":26,"group_members":27,"associates":28,"confused_with":29,"type_localities":30,"occurrence_total":31,"citations":32,"images":37,"structures":224,"synonyms":225,"language_names":229,"wikidata_qid":8,"texts":230},1441,"1:1:1441:6","e8e46141-a47d-45c1-afd4-274ba5126ff9","Fairburn Agate",null,2,"variety",7602,280,false,"SiO\u003Csub>2\u003C\u002Fsub>",[16,17],"Si","O",[16,17],"0","For the town of Fairburn, South Dakota where they were first found",0,"2025-08-11 12:14:20",{"id":11,"name":24,"entrytype":9,"csystem":8,"ima_formula":8,"mindat_formula":14,"hmin":8,"hmax":8,"dmeas":19,"dcalc":8,"strunz10ed1":8,"primary_image_id":25},"Fortification Agate",55548,[],[],[],[],[],12,[33],{"id":34,"year":35,"html":36,"doi":8},12962493,1971,"Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. \u003Ci>Educational Circular\u003C\u002Fi> 2. University of Nebraska - Conservation and Survey Divsion",[38,48,56,64,71,79,86,93,100,107,114,121,128,135,142,150,158,165,172,179,186,193,200,208,216],{"id":39,"source_url":40,"license_code":41,"credit_html":42,"title":43,"description":44,"author":45,"original_width":46,"original_height":47},54161,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=74174977","CC BY 2.0","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=74174977\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Fairburn Agate (ultimately derived from the Minnelusa Formation, Pennsylvanian-Permian; collected east of the Black Hills, western South Dakota, USA) 32 (44632240655).jpg","\u003Cp>Agate (\"Fairburn Agate\") from South Dakota, USA. (~3.15 centimeters across at its widest)\n\u003C\u002Fp>\u003Cp>\"Agate\" is a rockhound\u002Fcollector term for cavities in rocks (usually sedimentary rocks such as limestone or igneous rocks such as basalt) that have been partially or completely filled with irregularly concentric layers of microcrystalline, fibrous quartz (chalcedony - SiO2).  Agate is quartz.\n\u003C\u002Fp>\u003Cp>Attractive, multicolored and multipatterned agate has long been collected from a large area near the towns of Fairburn and Interior and south of the town of Kadoka and in the White River Badlands.  This region has surficial, loose, late Cenozoic-aged gravels derived from weathering and erosion of bedrock in the Black Hills.  Some of this gravel is agate.  The Fairburn-area agates are remarkably colorful and desirable.  The highest-quality examples have sold in the past for between 10,000 and 20,000 American dollars.\n\u003C\u002Fp>\nStudies have shown that Fairburn Agate is ultimately derived from limestones of the Minnelusa Formation (Upper Pennsylvanian to Lower Permian), which outcrops in the nearby Black Hills.","James St. John",1959,1208,{"id":49,"source_url":50,"license_code":41,"credit_html":51,"title":52,"description":53,"author":45,"original_width":54,"original_height":55},54162,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=82974701","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=82974701\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Fairburn Agate (ultimately derived from the Minnelusa Formation, Pennsylvanian-Permian; collected east of the Black Hills, western South Dakota, USA) 5 (26556285131).jpg","\u003Cp>Agate (\"Fairburn Agate\") from the Black Hills of western South Dakota, USA.\n\u003C\u002Fp>\u003Cp>\"Agate\" is a rockhound\u002Fcollector term for cavities in rocks (usually sedimentary rocks such as limestone or igneous rocks such as basalt) that have been partially or completely filled with irregularly concentric layers of microcrystalline, fibrous quartz (chalcedony - SiO2).  Agate is quartz.\n\u003C\u002Fp>\u003Cp>Attractive, multicolored and multipatterned agate has long been collected from a large area near the towns of Fairburn and Interior and south of the town of Kadoka and in the White River Badlands.  This region has surficial, loose, late Cenozoic-aged gravels derived from weathering and erosion of bedrock in the Black Hills.  Some of this gravel is agate.  The Fairburn-area agates are remarkably colorful and desirable.  The highest-quality examples have sold in the past for between 10,000 and 20,000 American dollars.\n\u003C\u002Fp>\nStudies have shown that Fairburn Agate is ultimately derived from limestones of the Minnelusa Formation (Upper Pennsylvanian to Lower Permian), which outcrops in the nearby Black Hills.",1607,1436,{"id":57,"source_url":58,"license_code":41,"credit_html":59,"title":60,"description":61,"author":45,"original_width":62,"original_height":63},54163,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=82974769","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=82974769\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Fairburn Agate (ultimately derived from the Minnelusa Formation, Pennsylvanian-Permian; collected in national grasslands east of the Black Hills, western South Dakota, USA) 5 (32715385646).jpg","\u003Cp>Agate (\"Fairburn Agate\") from the Black Hills of western South Dakota, USA. (public display, National Rockhound Hall of Fame, Murdo, South Dakota, USA)\n\u003C\u002Fp>\u003Cp>\"Agate\" is a rockhound\u002Fcollector term for cavities in rocks (usually sedimentary rocks such as limestone or igneous rocks such as basalt) that have been partially or completely filled with irregularly concentric layers of microcrystalline, fibrous quartz (chalcedony - SiO2).  Agate is quartz.\n\u003C\u002Fp>\u003Cp>Attractive, multicolored and multipatterned agate has long been collected from a large area near the towns of Fairburn and Interior and south of the town of Kadoka and in the White River Badlands.  This region has surficial, loose, late Cenozoic-aged gravels derived from weathering and erosion of bedrock in the Black Hills.  Some of this gravel is agate.  The Fairburn-area agates are remarkably colorful and desirable.  The highest-quality examples have sold in the past for between 10,000 and 20,000 American dollars.\n\u003C\u002Fp>\nStudies have shown that Fairburn Agate is ultimately derived from limestones of the Minnelusa Formation (Upper Pennsylvanian to Lower Permian), which outcrops in the nearby Black Hills.",1492,1006,{"id":65,"source_url":66,"license_code":41,"credit_html":67,"title":68,"description":61,"author":45,"original_width":69,"original_height":70},54164,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=82974773","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=82974773\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Fairburn Agate (ultimately derived from the Minnelusa Formation, Pennsylvanian-Permian; collected near Fairburn, western South Dakota, USA) 2 (31942188353).jpg",1582,1471,{"id":72,"source_url":73,"license_code":41,"credit_html":74,"title":75,"description":76,"author":45,"original_width":77,"original_height":78},54165,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=82974808","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=82974808\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Fairburn Agate (ultimately derived from the Minnelusa Formation, Pennsylvanian-Permian; collected east of the Black Hills, western South Dakota, USA) 8 (31972280503).jpg","\u003Cp>Agate (\"Fairburn Agate\") from the Black Hills of western South Dakota, USA. (public display, South Dakota School of Mines Museum of Geology, Rapid City, South Dakota, USA)\n\u003C\u002Fp>\u003Cp>\"Agate\" is a rockhound\u002Fcollector term for cavities in rocks (usually sedimentary rocks such as limestone or igneous rocks such as basalt) that have been partially or completely filled with irregularly concentric layers of microcrystalline, fibrous quartz (chalcedony - SiO2).  Agate is quartz.\n\u003C\u002Fp>\u003Cp>Attractive, multicolored and multipatterned agate has long been collected from a large area near the towns of Fairburn and Interior and south of the town of Kadoka and in the White River Badlands.  This region has surficial, loose, late Cenozoic-aged gravels derived from weathering and erosion of bedrock in the Black Hills.  Some of this gravel is agate.  The Fairburn-area agates are remarkably colorful and desirable.  The highest-quality examples have sold in the past for between 10,000 and 20,000 American dollars.\n\u003C\u002Fp>\nStudies have shown that Fairburn Agate is ultimately derived from limestones of the Minnelusa Formation (Upper Pennsylvanian to Lower Permian), which outcrops in the nearby Black Hills.",3176,2780,{"id":80,"source_url":81,"license_code":41,"credit_html":82,"title":83,"description":76,"author":45,"original_width":84,"original_height":85},54166,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=82974815","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=82974815\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Fairburn Agate (ultimately derived from the Minnelusa Formation, Pennsylvanian-Permian; collected east of the Black Hills, western South Dakota, USA) 13 (32745751066).jpg",2940,2348,{"id":87,"source_url":88,"license_code":41,"credit_html":89,"title":90,"description":76,"author":45,"original_width":91,"original_height":92},54167,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=82974817","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=82974817\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Fairburn Agate (ultimately derived from the Minnelusa Formation, Pennsylvanian-Permian; collected east of the Black Hills, western South Dakota, USA) 14 (32406085500).jpg",2684,2080,{"id":94,"source_url":95,"license_code":41,"credit_html":96,"title":97,"description":76,"author":45,"original_width":98,"original_height":99},54168,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=82974823","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=82974823\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Fairburn Agate (ultimately derived from the Minnelusa Formation, Pennsylvanian-Permian; collected east of the Black Hills, western South Dakota, USA) 20 (32406083320).jpg",2396,2100,{"id":101,"source_url":102,"license_code":41,"credit_html":103,"title":104,"description":76,"author":45,"original_width":105,"original_height":106},54169,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=82974824","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=82974824\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Fairburn Agate (ultimately derived from the Minnelusa Formation, Pennsylvanian-Permian; collected east of the Black Hills, western South Dakota, USA) 21 (32406082820).jpg",2280,1844,{"id":108,"source_url":109,"license_code":41,"credit_html":110,"title":111,"description":76,"author":45,"original_width":112,"original_height":113},54170,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=82974826","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=82974826\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Fairburn Agate (ultimately derived from the Minnelusa Formation, Pennsylvanian-Permian; collected east of the Black Hills, western South Dakota, USA) 22 (32406082670).jpg",1628,1144,{"id":115,"source_url":116,"license_code":41,"credit_html":117,"title":118,"description":76,"author":45,"original_width":119,"original_height":120},54171,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=82974828","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=82974828\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Fairburn Agate (ultimately derived from the Minnelusa Formation, Pennsylvanian-Permian; collected east of the Black Hills, western South Dakota, USA) 24 (32406082520).jpg",1868,1856,{"id":122,"source_url":123,"license_code":41,"credit_html":124,"title":125,"description":76,"author":45,"original_width":126,"original_height":127},54172,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=82974831","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=82974831\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Fairburn Agate (ultimately derived from the Minnelusa Formation, Pennsylvanian-Permian; collected east of the Black Hills, western South Dakota, USA) 26 (32406082220).jpg",1556,1148,{"id":129,"source_url":130,"license_code":41,"credit_html":131,"title":132,"description":76,"author":45,"original_width":133,"original_height":134},54173,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=82974832","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=82974832\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Fairburn Agate (ultimately derived from the Minnelusa Formation, Pennsylvanian-Permian; collected east of the Black Hills, western South Dakota, USA) 28 (32406081870).jpg",2088,1888,{"id":136,"source_url":137,"license_code":41,"credit_html":138,"title":139,"description":53,"author":45,"original_width":140,"original_height":141},54174,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=82974896","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=82974896\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Fairburn Agate (ultimately derived from the Minnelusa Formation, Pennsylvanian-Permian; collected east of the Black Hills, western South Dakota, USA) 4 (26621663125).jpg",2257,1406,{"id":143,"source_url":144,"license_code":41,"credit_html":145,"title":146,"description":147,"author":45,"original_width":148,"original_height":149},31544,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=82974897","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=82974897\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Fairburn Agate (ultimately derived from the Minnelusa Formation, Pennsylvanian-Permian; collected east of the Black Hills, western South Dakota, USA) 3 (26595586336).jpg","\u003Cp>Agate (\"Fairburn Agate\") from the Black Hills of western South Dakota, USA.\n\u003C\u002Fp>\u003Cp>\"Agate\" is a rockhound\u002Fcollector term for cavities in rocks (usually sedimentary rocks such as limestone or igneous rocks such as basalt) that have been partially or completely filled with irregularly concentric layers of microcrystalline, fibrous quartz (chalcedony - SiO2).  Agate is quartz.\n\u003C\u002Fp>\u003Cp>Attractive, multicolored and multipatterned agate has long been collected from a large area near the towns of Fairburn and Interior and south of the town of Kadoka and in the White River Badlands.  This region has surficial, loose, late Cenozoic-aged gravels derived from weathering and erosion of bedrock in the Black Hills.  Some of this gravel is agate.  The Fairburn-area agates are remarkably colorful and desirable.  The highest-quality examples have sold in the past for between 10,000 and 20,000 American dollars.\n\u003C\u002Fp>\u003Cp>Studies have shown that Fairburn Agate is ultimately derived from limestones of the Minnelusa Formation (Upper Pennsylvanian to Lower Permian), which outcrops in the nearby Black Hills.\n\u003C\u002Fp>\nShown above is a Fairburn Agate specimen with \"megaquartz\" lining a central cavity.",2017,1419,{"id":151,"source_url":152,"license_code":41,"credit_html":153,"title":154,"description":155,"author":45,"original_width":156,"original_height":157},54175,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=93822225","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=93822225\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Agate (east of the Black Hills, South Dakota, USA) 1.jpg","Agate from near the Black Hills of western South Dakota, USA.\n\u003Cp>\"Agate\" is a rockhound\u002Fcollector term for cavities in rocks (usually sedimentary rocks such as limestone or igneous rocks such as basalt) that have been partially or completely filled with irregularly concentric layers of microcrystalline, fibrous quartz (chalcedony - SiO2).  Agate is quartz.\n\u003C\u002Fp>\u003Cp>Attractive, multicolored and multipatterned agate has long been collected from a large area near the towns of Fairburn and Interior and south of the town of Kadoka and in the White River Badlands.  This region has surficial, loose, late Cenozoic-aged gravels derived from weathering and erosion of bedrock in the Black Hills.  Some of this gravel is agate.  The Fairburn-area agates are remarkably colorful and desirable.  The highest-quality examples have sold in the past for between 10,000 and 20,000 American dollars.\n\u003C\u002Fp>\u003Cp>Studies have shown that Fairburn Agate is ultimately derived from limestones of the Minnelusa Formation (Upper Pennsylvanian to Lower Permian), which outcrops in the nearby Black Hills.\n\u003C\u002Fp>\u003Cp>This specimen has been identified as a Fairburn Agate, but I am uncertain.\n\u003C\u002Fp>\nLocality: undisclosed site east of the Black Hills, western South Dakota, USA",2314,1515,{"id":159,"source_url":160,"license_code":41,"credit_html":161,"title":162,"description":155,"author":45,"original_width":163,"original_height":164},54176,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=93822226","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=93822226\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Agate (east of the Black Hills, South Dakota, USA) 3.jpg",2388,1813,{"id":166,"source_url":167,"license_code":41,"credit_html":168,"title":169,"description":155,"author":45,"original_width":170,"original_height":171},54177,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=93822229","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=93822229\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Agate (east of the Black Hills, South Dakota, USA) 4.jpg",2044,1764,{"id":173,"source_url":174,"license_code":41,"credit_html":175,"title":176,"description":155,"author":45,"original_width":177,"original_height":178},54178,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=93822232","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=93822232\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Agate (east of the Black Hills, South Dakota, USA) 6.jpg",2538,1430,{"id":180,"source_url":181,"license_code":41,"credit_html":182,"title":183,"description":155,"author":45,"original_width":184,"original_height":185},54179,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=93822233","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=93822233\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Agate (east of the Black Hills, South Dakota, USA) 7.jpg",2518,1440,{"id":187,"source_url":188,"license_code":41,"credit_html":189,"title":190,"description":155,"author":45,"original_width":191,"original_height":192},54180,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=93822237","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=93822237\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Agate (east of the Black Hills, South Dakota, USA) 10.jpg",2896,1970,{"id":194,"source_url":195,"license_code":41,"credit_html":196,"title":197,"description":155,"author":45,"original_width":198,"original_height":199},54181,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=93822238","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=93822238\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Agate (east of the Black Hills, South Dakota, USA) 11.jpg",2737,2221,{"id":201,"source_url":202,"license_code":41,"credit_html":203,"title":204,"description":205,"author":45,"original_width":206,"original_height":207},54182,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=117573688","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=117573688\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Agate (east of the Black Hills, South Dakota, USA) 18 - 51224409863.jpg","\"Agate\" is a rockhound\u002Fcollector term for cavities in rocks (usually sedimentary rocks such as limestone or igneous rocks such as basalt) that have been partially or completely filled with irregularly concentric layers of microcrystalline, fibrous quartz (chalcedony - SiO2).  Agate is quartz.\n\u003Cp>Attractive, multicolored and multipatterned agate has long been collected from a large area near the towns of Fairburn and Interior and south of the town of Kadoka and in the White River Badlands.  This region has surficial, loose, late Cenozoic-aged gravels derived from weathering and erosion of bedrock in the Black Hills.  Some of this gravel is agate.  The Fairburn-area agates are remarkably colorful and desirable.  The highest-quality examples have sold in the past for between 10,000 and 20,000 American dollars.\n\u003C\u002Fp>\u003Cp>Studies have shown that Fairburn Agate is ultimately derived from limestones of the Minnelusa Formation (Upper Pennsylvanian to Lower Permian), which outcrops in the nearby Black Hills.\n\u003C\u002Fp>\u003Cp>This specimen has been identified as a Fairburn Agate, but I am uncertain.\n\u003C\u002Fp>\nLocality: attributed to the east-of-Black Hills area, western South Dakota, USA",2249,1513,{"id":209,"source_url":210,"license_code":41,"credit_html":211,"title":212,"description":213,"author":45,"original_width":214,"original_height":215},54183,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=136831843","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=136831843\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Agate (east of the Black Hills, South Dakota, USA) 30.jpg","Agate from western South Dakota, USA.\n\u003Cp>\"Agate\" is a rockhound\u002Fcollector term for cavities in rocks (usually sedimentary rocks such as limestone or igneous rocks such as basalt) that have been partially or completely filled with irregularly concentric layers of microcrystalline, fibrous quartz (chalcedony - SiO2).  Agate is quartz.\n\u003C\u002Fp>\u003Cp>Attractive, multicolored and multipatterned agate has long been collected from a large area near the towns of Fairburn and Interior and south of the town of Kadoka and in the White River Badlands.  This region has surficial, loose, late Cenozoic-aged gravels derived from weathering and erosion of bedrock in the Black Hills.  Some of this gravel is agate.  The Fairburn-area agates are remarkably colorful and desirable.  The highest-quality examples have sold in the past for between 10,000 and 20,000 American dollars.\n\u003C\u002Fp>\u003Cp>Studies have shown that Fairburn Agate is ultimately derived from limestones of the Minnelusa Formation (Upper Pennsylvanian to Lower Permian), which outcrops in the nearby Black Hills.\n\u003C\u002Fp>\u003Cp>This specimen has been identified as a Fairburn Agate - I'm not sure whether it is or not.\n\u003C\u002Fp>\nLocality: undisclosed site east of the Black Hills, western South Dakota, USA",2244,1927,{"id":217,"source_url":218,"license_code":41,"credit_html":219,"title":220,"description":221,"author":45,"original_width":222,"original_height":223},54184,"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=136831861","James St. John, via \u003Ca href=\"https:\u002F\u002Fcommons.wikimedia.org\u002F?curid=136831861\" rel=\"noopener\">Wikimedia Commons\u003C\u002Fa>","Agate (east of the Black Hills, South Dakota, USA) 27.jpg","Agate from western South Dakota, USA.\n\u003Cp>\"Agate\" is a rockhound\u002Fcollector term for cavities in rocks (usually sedimentary rocks such as limestone or igneous rocks such as basalt) that have been partially or completely filled with irregularly concentric layers of microcrystalline, fibrous quartz (chalcedony - SiO2).  Agate is quartz.\n\u003C\u002Fp>\u003Cp>Attractive, multicolored and multipatterned agate has long been collected from a large area near the towns of Fairburn and Interior and south of the town of Kadoka and in the White River Badlands.  This region has surficial, loose, late Cenozoic-aged gravels derived from weathering and erosion of bedrock in the Black Hills.  Some of this gravel is agate.  The Fairburn-area agates are remarkably colorful and desirable.  The highest-quality examples have sold in the past for between 10,000 and 20,000 American dollars.\n\u003C\u002Fp>\u003Cp>Studies have shown that Fairburn Agate is ultimately derived from limestones of the Minnelusa Formation (Upper Pennsylvanian to Lower Permian), which outcrops in the nearby Black Hills.\n\u003C\u002Fp>\u003Cp>This specimen has been identified as a Fairburn Agate - it probably is.\n\u003C\u002Fp>\nLocality: undisclosed site east of the Black Hills, western South Dakota, USA",3532,2406,[],[226,227,228],"Fairburnit","Fairburnita","Fairburnite",[],{"history":8,"applications":8}]